1 Department of Epidemiology, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA; School of Public Health and Medicine, University of the Witwatersrand, Johannesburg, South Africa. Electronic address: [email protected].
2 Institute for Global Health and Infectious Diseases, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA.
3 The Desmond Tutu HIV Centre, University of Cape Town, Cape Town, South Africa.